Study on Annealing Process of High-strength 5A06 Aluminum Alloy Sheet for Special Equipment
ZHAO Qizhong1,2,5, LI Chengbo3,*, WANG Chunxia2, XU Xi3, YANG Hongchi1, LU Xianye1, YAN Yan1,5, SUN Yilin4, RUAN Jinde1
1 ALG Aluminium Inc., Nanning 530031, China 2 College of Materials Science and Engineering, Guilin University of Technology, Guilin, 541004, Guangxi, China 3 School of Mechanical Engineering and Mechanics, Xiangtan University, Xiangtan, 411105, Hunan, China 4 China Aerospace Manufacturing Technology Research Institute, Beijing, 110024, China 5 ALG Aluminium lnc., Guangxi Key Laboratory of Materials and Processes of Aluminum Alloys, Nanning 530031, China
Abstract: The effects of annealing temperature on the mechanical properties, corrosion resistance, and microstructure of 5A06 aluminum alloy cold-rolled sheet were studied by tensile testing, intergranular corrosion testing, optical microstructure observation, and electron backscatter diffraction (EBSD) analysis. The research results show that for 5A06 aluminum alloy cold-rolled sheets used in special equipment, when the annealing temperature is below 120 ℃, it's the stabilization annealing stage, and the intergranular corrosion resistance of the alloy is slightly improved. The annealing temperature within the range of 150 to 240 ℃ is the recovery treatment stage, during which the intergranular corrosion resistance of the alloy sharply decreases. The annealing temperature within the range of 270 to 330 ℃ is the recrystallization stage of the alloy, during which the β (Al3Mg2) phase undergoes dissolution, and the intergranular corrosion resistance of the alloy is rapidly improved, with mechanical properties tending towards the fully annealed state; The annealing temperature within the range of 360 to 540 ℃ is the recrystallization growth stage of the alloy. When the annealing temperature exceeds 540 ℃, the grain coarsening of the alloy is severe, and the mechanical and corrosion properties of the alloy deteriorate. The optimal stabilization annealing temperature range is 90 to 120 ℃, and the optimal O-state annealing temperature is 330 ℃. Overburning occurs when the annealing temperature is higher than 540 ℃.
赵启忠, 李承波, 王春霞, 徐夕, 杨鸿驰, 卢贤业, 闫焱, 孙宜琳, 阮晋德. 特种装备用高强度5A06铝合金板材退火工艺研究[J]. 材料导报, 2025, 39(19): 24090208-5.
ZHAO Qizhong, LI Chengbo, WANG Chunxia, XU Xi, YANG Hongchi, LU Xianye, YAN Yan, SUN Yilin, RUAN Jinde. Study on Annealing Process of High-strength 5A06 Aluminum Alloy Sheet for Special Equipment. Materials Reports, 2025, 39(19): 24090208-5.
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2025, Vol. 39 
